Re: [Xen-devel] IOMMU and AMD 890fx

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Thx for the forum threads, i have changed the wiki about vt-d/iommu to reflect 
these new experiences.

I was hoping AMD would be able to do a better job than Intel, and have learned 
from the BIOS missery Intel has with there VT-d, and instruct/help the 
manafacturers getting their bioses right.
It's a pity that a nice feature isn't supported. No sense in upgrading my setup 
then to a six core and mobo with IOMMU. :(


--
Sander



> Gigabyte motherboards don't support IOMMU:
> http://forums.tweaktown.com/f69/ga-890fxa-ud5-iommu-bios-switch-39801/

> MSI boards have the same problems:
> http://comments.gmane.org/gmane.comp.emulators.xen.user/58630

> ASUS Crosshair IV Formula has IOMMU, but I cannot find if it works with Xen.




> On Sun, May 9, 2010 at 11:38 PM, Sander Eikelenboom 
> <linux@xxxxxxxxxxxxxx>wrote:

>> Hello Wei,
>>
>> I hope motherboard manufacturers do a better job with supporting this iommu
>> in the bios than they did with intel's. Especially Asus made a mess of it,
>> and hasn't fixed it in newer bioses for multiple motherboards.
>> And since all motherboard reviews don't mention nor test the iommu it's
>> hard to know upfront if it's supported :-(
>>
>> --
>>
>> Sander
>>
>> > Leonardo,
>>
>> > I can confirm that AMD 890FX supports IOMMU v1.22. It was briefly
>> mentioned by external sites, such as
>> http://techreport.com/articles.x/18825. It looks like Asus, Gigabyte and
>> MSI will ship motherboards with 890FX chipset. Xen 4.0 fully supports AMD
>> IOMMU v1.2. Note that IOMMU needs support from BIOS (ACPI IVRS table).
>> Please pay a bit attention to this area.
>>
>> > -Wei
>>
>> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:
>> xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Leonardo Prosperi
>> > Sent: Sunday, May 09, 2010 1:02 PM
>> > To: xen-devel@xxxxxxxxxxxxxxxxxxx
>> > Subject: [Xen-devel] IOMMU and AMD 890fx
>>
>>
>> > Hi,
>> > All the reviews for the AMD 890fx chipset reported that it supports IOMMU
>> v1.2.
>> > But I cannot find any mention of that on AMD site.
>>
>> > Does 890fx support IOMMU?
>> > Do 890fx motherboards with IOMMU exist?
>> > Does Xen support 890fx?
>>
>> > Regards,
>> > Leonardo
>>
>>
>>
>>
>> --
>> Best regards,
>>  Sander                            mailto:linux@xxxxxxxxxxxxxx
>>
>>



-- 
Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx


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